Elastic tire and process of manufacturing same.



o. 708,225. f Patented Sept. 2, I902. N F. E. HALL.

ELASTI'C TIRE AND PROCESS-0F MANUFACTURING SAME.

` (Application led Feb. 23, 1900.) '/(No Model.)

THF. mums permito.. maremma.. wAsnlwroN, n. c.

UNrrnn STATES PATENT FFICE.

FRANK E. IIALL, OF QUINCY, MASSACHUSETTS.

ELASTIC'TIRE ANDI eccola-ss` oF MANUFACTURING SAME.

SPECIFICATION forming part vof Letters Patent No. 708,225, dated.September 2, 1902.

Application filed February 23, 1900. Serial No. 6,137. (No model.)

To a/ZZ whom it' may concern:

Be it known that I, FRANK ELMER HALL, of Quincy, in the county ofNorfolk and State of Massachusetts, have invented certain, new anduseful Improvements in Elastic Tires and a new and useful Process oflVIanufaGturing the Same, of whichthe following is a speciiication.

after described, and particularly pointed outv in the claims.' f Y Inthe accompanying drawings, Figure lis a longitudinal central sectionthrough a mold,

with the rubber and wires for making the' passages in place in the moldused in the first step of vulcanization. Fig. 2 is across-section viewthrough the mold With' the rubber in place and the wires withdrawn,showing the passages. ing semivulcanized inthe mold Wound on an arbor togive it the forni of a spiral spring-. Fig. 4 shows the tire after beingfully vulcanized and taken fromithe arbor in the form ofl a spiralspring, with the diameter much smaller than the diameter of the'wheel towhich it is to be applied'. Fig. 5 shows a section of the tire aftercomplete vulcanization forming a circle much smaller in diameter thanthe diameter of the wheel to which it is.

to be applied. Fig. 6 shows the section of tire opened out of a circleof larger diameter, causing a compression in the periphery of the tireand a slight elongation of thebase. Fig. 7 is a detail view of Aacross-section of a tire with one elongated passage instead of twopassages shown in the other views.

Like letters of reference refer to like parts throughout the severalviews.

A represents the iron mold in which the rubber tire B is semivulcanizedto give it its crosssection shape, as shown` in Fig. 2, and C representsone of the metal rods'held in place by thumb screws C', and said rodsextend -the tire to elongate.

Fig. 3 shows the tire after'be' through the rubber tire B and areafterward withdrawn to form the passages DAD, Fig. 2. The tire B` afterbeing taken fromthe` mold A and after the rods C' have been withdrawn iswound or coiled around the arbor E, Fig. 3, to be fully vulcanized. Thetire B on the arbor E is then placed in the heater and vulcanizationcompleted, after which itis taken from the heater and removed from thearbor E, as shown in Fig. 4. The passages are reinforced by metal, duck,or other fibrous material D', and the single elongated passage G (shownin Fig. 7) is reinforced by metal, duck, or other fibrous material G.'Cottonduck F or other suitable fibrous reinforcing material isvulcanized to the base of the tire and being semi-elastic will allow thebase of 'I vhe distance between the points H h, Fig. 5, is practicallytwelve inches on a circle about eight inches in diameter measured on theperiphery of the tire in the molded form as it is taken from the arborcompletely vulcanized. The tire when vopened out to conform totheperiphery of an low a slight elongation of the' base and produce alarger compression of the rubber on the periphery of the tire. When thetire is opened out, soas to conform to a larger circle (as a wheel) thanthat in which it was vulcanized, the base is stretched and put-s thetire under tension when placed on the wheel having atendency to contracton the wheel, consequently putting the tire under tension on-the wheeland-preventing the tire from creeping. nFrom the above it is clearrthatthe circumference of the tire when removed from the arborjE is less thanthe circumference of the tire when applied to the felly ofthe wheel. Ido not limit myself to the arrangement and construction shown, as 'thesame maybe varied without departing from the spirit of my invention. ,p

IOO

Having thus ascertained the nature of my invention and set forth aconstruction embodying the same, what I claim as new, and desire tosecure by Letters Patent of the United States, is-

1. The herein-described process which consists, first, insemivulcanizing the tire in a mold to give it its cross-section shape,second, in coiling said tire with a circumference less than itscircumference when applied to the Wheel to expand the outer periphery,and third, in fully vulcanizing said tire in its coiled position so thatwhen applied to the Wheel the outer periphery Will compress.

2. The herein-described process,which consists, first, insemivulcanizing the tire in a straight mold to give itits cross-sectionshape, second, in coiling said tire with a circumference less than itscircumference when applied to the Wheel to expand the outer periphery,and third, in fully vulcanizing said tire in its coiled position so thatwhen applied to the wheel the outer periphery will compress.

3. The herein-described process which consists, first, insemivnlcanizing the tire in a mold to give it its cross-section shapewith one or more continuous passages, second, in coiling said tire witha circumference less than its circumference when applied to the Wheel toexpand the outer periphery, and third, in fully Vnlcanizing said tire inits one or more continuous passages and with a i reinforced base,second, in coiling said tire with a circumference less than itscircumference when applied to the wheel to expand the outer periphery,and third, in fully vulcanizing said tire in its coiled position so thatwhen applied to the wheel the outer periphery will compress.

5. As an article of manufacture, an elastic tire provided with one ormore continuous longitudinal passages and having a normal circumferenceless than its circumference when applied to the Wheel and havingan outerperiphery longer than its inner periphery and provided with reinforcingmaterial vulcanized in said passages and with yielding reinforcingmaterial vulcanized to its base.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 10th day of February, A. D.1900.

FRANK E. HALL.

Witnesses:

A. L. MESSER, E. L. HARLOW.

